The Chakravarti Ghostly King was a fifth tier Great Void Ghostly Realm Ghostly king, the equivalent of a fifth tier immortal king.

In the Sky Palaces, immortal kings of this tier controlled five heavenly rules. Hence, they were called 5-Heavens Immortal Kings. 

Of all the immortal kings, the 9-Heavens Immortal Kings were the most terrifying.

However, in the 10,000 Levels of Hell, they did not use the word "heaven" from “heavenly rules” to describe the fifth tier ghostly kings. Rather, they used the word “hell.”

For instance, as a fifth tier ghostly king, the Chakravarti Ghostly King was a 5-Hells Ghostly King.

Similarly, of all the ghostly kings, the 9-Hells Ghostly Kings were the most terrifying. Their power was only secondary to the eternal immortal emperors!

If not for the 10th Grade Palace of an Immortal King, Wu Yu would only be strong enough to kill a 1-Hell Ghostly King. How could he ever manage to slay a 3-Hells Ghostly King or a 5-Hells Ghostly King?

In the 10th Grade Palace of an Immortal King, the Chakravarti Ghostly King's power was suppressed and capped at the level of a 1-Hell Ghostly King. Otherwise, he could easily slaughter Wu Yu. Wu Yu would never even get the opportunity to enter a stalemate with him.

Hence, this was a precious and rare opportunity for Wu Yu to devour a 5-Hells...